Mechanical stoker.



P. J. HARLEMAN.

MECHANICAL sToKBR.

APPLICATION I'IALED A'UG.16. 1906. v 944,55 1 Patented Dec. 28, 1909.I

Z SHEETS-SHEET 1.

P. J. HARLEMAN.

MECHANICAL STOKER. L

APPLIUATION FILED AUG.16,1906.

2 SHEETS-SHEET 2.

Patented Dec.28, 1909.

PETER J'. HARLEMAN, vOF BOSTON, MASSACHUSETTS.

.c MECHANICAL STOKER.

Specification of Letters Patent.

Patented Dec. as, 1909.

. Application filed 'Augustll 1906. Serial No. 330,785.

To all who'mit may concern.'- `A Be `it`known th-at '1,- PETER J.. HARLEMAN,

'a citizen of the UnitedStates, residing in Boston, in thecounty of Suffolk and` State of Massachusetts, have `invented an Im,- provement in Mechanical Stokers, ,of which the following description, in connection with the accompanying-drawingsh is a specification, like letters on. the drawings represent- 'ing like parts. Y ,Y

The present vinvention vrelates to a mechanical stoker of the travelingl grate type,

in which` the'fuel isfed by., gravityupon the grate .bars'and is carried along through the furnace during combustion.-v

The invention is embodied in a stoker of' the traveling grate type, and relates mainly to novel features of construction and arrangement whereby the grate-bars are kept clear of slag, and prevented' from clogging,v

while the fuel is continually agitated, so that combustion takes the mass. j

A further feature l.of the invention lconsists in means Vfor protecting the endless chains, each link of the chain having a pro'- tecting `member which also serves to protect an operating device for producing the rotat ing movement of e'acli grate bar which takes place in Ithe travel of the chain. A

A further featureof the invention consists in a novel construction and arrange' ment of the driving chain for. the grate bars which fa-cilitatesvthe removal of any one link or grate bar if one needs to be replaced.

Figure l is a side elevation, partly 1n sec tion, of a boiler provided with a Stoker enibodying the invention; Fig. 2 isan enlarged detail in section, on two different vertical planes, part being shown on a plane outside of the` driving sprockets for the' grate bars, and partl through the grate bars themselves;l Figs. 3 and t are perspective views showing details of the chain; and Fig.

5 is a transverse section through one of the Agrate bars and the chain links connected therewith, the parts being broken, as is'v necessary to show` the entire-width of the grate. .v In accordance with the invention, each grate bar v'consists ina series of disks a separated fromcach other by means of hubs a2.' As best shown in Fig. 5these disks are assembled upon an octagonal rod4 a3 which ex- V tends across from one side of the'fire pot to y the other,

the said rod being furtherproplace readily throughout' the sideof the fire pot toward the j -proper. These members are provided with vided' with a sprocket Wheel a4, the teeth ofwhicli are arranged to be engaged inthe travel of the-'grate bars by projections b which extend longitudinally through the fire. pot-at opposite sides thereof, as indicated `in Figs. 2 and 5'.

The ends of the octagonal rods a3- are cylindrical, as indicated at. a5, so as to be-ca'- pable of rotation in the chain linkse, o?

which produce the traveling movement of the vgiate'bars in Yconjunction with a n'iee'jr chanically rotated shaft l carrying a.

sprocket d2'. v the construction shown, the sprocket cl2v is'provided with four tethd" so spaced as to engage alternate links of the traveling chain` which construction admits.'

,of making the chain of substantially uni#` 'form width throughout its-entire'length, as

will be hereinafter described.

The link construction is best 4shown in Figs. 3, 4 and 5, the links c being arranged in pairs, as indicated, while the links c2 have.

lugs ozoat each end, ywhich are joined by the cross pins c4 to the link c. The bodies of the links c2, however, are extended to a 'width'l which brings them into.alinement'with the sides of the links c', the said bodies having projectingmembers 022 which correspond to similar projecting members c from the sides of the links c. The projections c and 0122 underlie internally projecting flanges A2 formed in the side walls A which inclose the grate and ash pit, while the chain'as a Whole travels on rollers A3 which are supported in bars A4 and A5 extending longitudinally along the grate These bars in turn are supported upon cross members AG secured as lby bolts or rivets A7 in the side members A,

and extending completely across' fromene side 'to -the other`of the iire chamber belowl the grate. vided with iiange's A which are providedat intervals with. sockets adapted to support the stems b2 of the stationary teeth b whiclico= operate with the sprocket wheels a* toturn.

In order to protect the chains, each' linkis provided with 'a cover member -c which'is shaped' at one. end. only to correspond ap .proximately to the spherical outline of the The bars A4 andfA5 are proioo 'the-grate -bars in the travel of the" chains.:V

grate-bar, and is raised andiiattened at the other endso as to shed the 'coal' away from ate bars ownwardly projecting' tongues e2 having lateral ianges e3 which it into correspond- .The cylindrical bearings for the grate bars are formed partly .in the members c and partly inthe links,'it being obvious that, by

this construction, all the parts can be readily taken to pieces for replacement. In other words, if the grate bar is to be removed, it isY necessary only to move the chain until the grate -bar is accessible at the outer end, and

then take olf the members e fromthe chains at opposite sides by driving them out of the channels c13 and 023, after which the grate bar can-be lifted out and a new one put in.

As best shown in Fig. 1, the chain grate at the end opposite the driving shaft d is carried over an idler sprocket,.the end of the shaft Z4 for which is shown as bearing in the side plates Al and projecting through the saine, -there being an adjusting rod d screw threaded in a lug al, and bearing against the end o f the shaft d4, so that any slack in the chain grate can be taken up,'or if the grate contracts the tension can be loosened.

Itwill be seen from the foregoing description that the grate bars, while having ample draft space,have smooth surfaces with no abutments to accumulate and hold clinkers,

while the rotation of the bars continually.

agitates the fuel and tends to keep the disks free from any crust or slag which would otherwise accumulate thereon. Furthermore, the drive chains will run smoothly over the rollers and will'be amply protected by the cover members e, and the chain is furtherheld down by the internally projecting flanges A2, so that the grate bar sprockets a* cannot fail to engage the projections b, as might be the case if ashes were to accumulate in suilicient quantities to clog the sprockets and allow Athe grate to ride over without turning the bars. The coal is fed upon the traveling grate through a hopper Il located in front of the furnace door B2,

and the amount of fuel which is actually fed to the fire pot may be regulated by means of a sliding door B3 which is herein shown as vertically movable in front of the fire doorB2 and connected with a suitable operating device herein shown as a roller or Windlass B4. This` affords asimple eXpedient for regulating the amount of fuel to be fed, the amount, of co'urse, depending upon the sip/.e of the opening controlled by the slide or door B3.

Claims. l'. In a mechanical Stoker, a traveling equal, and each link being provided with a bearing socket for one end 'of one of said revoluble grate bars; a cover or rejecting member cooperating with saidp bearing socket to complete the bearing for the grate bar, said member being detachable from the link for the purpose of removing the grate bar; means for imparting travel to said |`grate; and means for revolving the grate vbars during the travel of the grate.

'2. In a mechanical Stoker, a traveling grate comprising a series of cylindrical grate barseacli of which is composed of a revoluble bar and a series of disks thereon separated from each other to afford draft spaces, said grate being provided with drive chains the links of which are provided with bearings for the grate bars eachcons'isting of a bearing socket4 formed in the link and adetachable cover or projecting member hav- *inga corresponding socket to complete the bearing; means for imparting travel to said grate; and means for revolving the grate bars during the travel of the grate.

3. The combination with a fire box; of inclosing side members` therefor; transverse supporting members extending from one yside member to the other; longitudinal internal supports within said side members and mounted on said transverse supporting members, saidinternal supports being provided with bearings; rollers in said bearings; a travelinggra-te having driving chains at' opposite sides resting on said rollers;

- means for imparting travel to said grate; ro-

tatable grate bars having bearings in the links of said driving chains; sprocket wheels rigidly mounted on said grate bars; and stationary projections extending upward from said internal supports to coperate with said sprocket wheels, whereby the grate bars are rotated during the travel of the grate.

In testimony whereof, I ha'v'esigned my name to this specification in the presence of two subscribing witnesses.

PETER J. HARLEMANQ Witnesses M. E. COVENLY, H. J. LrvERi-ronn. 

